The experimental results presented in this paper clearly demonstrate that autogenous shrinkage can be reduced by internal curing. Either the use of saturated low-density fine aggregates or the addition of superabsorbent polymer particles can provide the extra curing water needed for cement hydration under sealed conditions. Autogenous shrinkage is reduced due to much larger pores (within the LWA or formed by the SAP particles themselves) being emptied than those typically emptied in cement paste during sealed hydration. Clearly, both the water content and its spatial distribution within the paste are important factors. An additional benefit of the internal curing approach to reducing autogenous shrinkage may be an increased degree of hydration and measured compressive strength at later ages, due to the increased and persistent availability of moisture.